Slowness effect doesn't prevent sprint jumping at regular speed

What I expected to happen while affected by slowness was: 

Not being able to sprint jump, or, at least, doing so at reduced speed

What actually happened was:
Being able to sprintjump, like the slowness effect wasn't even on me

Steps to Reproduce:
1. Be affected by slowness effect (the higher the effect level, the more it is noticable) 
2. Sprint
3. Jump